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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee3fa972541eba26b99e0ae635b0c00e46ee7758b56f66d4b425a3887340923' 
  AND token = '55rLYj5eh9iXqqutzZ/08KfOH82bgJ9sfegFzdxw4vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}